Yes, both Offer18 and Refersion offer a Free Trial.
Offer18 is designed for Large Enterprises, Medium Business and Small Business.
Refersion is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Offer18 Starts at $49/Month whereas for Refersion Starts at $89/Month.
Some top alternatives to Offer18 includes AffTrack, Post Affiliate Pro, TrackingDesk, Refersion, Affiliatise, TUNE, OffersHub, Affiliatics, Evotrack and Trackdesk.
Some top alternatives to Refersion includes AffTrack, Post Affiliate Pro, ClickInc, TrackingDesk, Affiliatise, OffersHub, Promocate, Affiliatics, ReferralCandy and Sir Filiate.